EDITABLE SURFACE and POLYCOUNT-------------------------------------------------------Model use displace map so mesh is subdividable, you can adjust amount of details and polycount, from Low Poly up to high detailed surface.'TurboSmooth' placed below 'Displace' modifier so subdivision visibly add details.Polycount of terrain after merged modifiers:

Exported formats has no bugs, Uv works correctly. Obviously there is no light in exported formats.Each format have three versions exported - low poly (so you can subdivide it as well), mid poly andhigh poly with polycount as noted above. You can also use attached displace map to build terrain from plane and control polycount as well (like 3ds max version). Skydome object included.

Model checked also with Unreal Engine. For real time engines you can import FBX model or buildlandscape inside engine editor from included displacement map.If you want to rebuild textures there are .psd file and additional maps.======================================================================================TEXTURES